Posted by **Chelsea** on Wednesday, September 15, 2010 at 12:23pm.

Find an expression for the function whose graph is the given curve.

The top half of the circle x^2 + (y-2)^2 = 4

My final answer is y= 2 +/- sqrt of x-4

However, I circled the positive sign because that's the top half. Is this right? I was not sure whether it was sqrt of x-4 or sqrt of x^2-4

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